One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,11)(8,10)(9,12)(13,14,18,19)(15,20,25,28)(16,24,27,21)(17,22,26,23)(5,7)(6,9)(8,12)(10,11)(13,15)(14,20)(16,26)(17,27)(18,25)(19,28)(21,22)(23,24) involution — undirected(1,2,3,4)(13,16,14,21,18,27,19,24)(15,23,28,17,25,22,20,26)(6,10)(9,11)(13,14,18,19)(15,20,25,28)(16,21,27,24)(17,23,26,22)(7,12)(9,11)(13,17,14,22,18,26,19,23)(15,24,28,16,25,21,20,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.